function s1_hello(){
    echo "hello,world!";
}
function s2_tell_who_i_am(){
    whoami;
}
function s3_which_distro_do_i_use(){
    cat /etc/*-release | grep "NAME=" |head -n 1;
}
function s4_view_my_cpu_arch(){
    arch;
}
function s5_show_first_scsi_disk_size(){
    lsblk -l | \grep disk | \grep '^sda ' |awk '{print $4}';
}
function s6_show_main_memory_size_in_megabytes(){
    free -m |grep "Mem:" |awk '{print $2}'
}
s1_hello
s2_tell_who_i_am
s3_which_distro_do_i_use
s4_view_my_cpu_arch
s5_show_first_scsi_disk_size
s6_show_main_memory_size_in_megabytes

